The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An oddly conical beacon perched atop beautiful Irish cliffs.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

A gated cross stands on the site where an Irish revolutionary met his end.

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

On the highest peak in the Harz Mountains, science and the occult faced off in a failed attempt to turn a goat into a boy.

The architect of this fanciful complex called it an "oasis for humanity and nature in a sea of rational houses."

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Electrical curiosity museum housed in an old transformer station.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Where once there was a train station bathroom, there is now this German burger joint.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

This German art chapel is perfect for those who like their worship hard, modern, and utterly alien.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

Amidst medieval and baroque buildings, five human-sized gherkins stand tall.

A beautiful maze marks where three countries meet.

A moving memorial to the fallen and missing from WWI trenches.

The highest point in Belgium is a staircase to nowhere.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A unique, free-floating electric ferry may be the only of its kind in Europe.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.